File:Bagged -Evening Express cartoon 1898.png|thumb|Cartoon of the would-be explorer Louis de Rougemont who claimed to have had adventures in Australasia.
An '''impostor''' (also spelled '''imposter''') is a person who pretends to be somebody else, often through means of disguise
, often to try to gain financial or social advantages through social engineering (security)|social engineering
, but just as often for purposes of espionage
or Law enforcement agency|law enforcement